I can't recommend one in particular, but I can clarify and say that St. Nicholas does talk about baptism and the eucharist in the one I mentioned, though it is within the larger context of the "life in Christ" and not solely about them. I didn't much like the one by Fr. John Meyendorff the last time I read it, fwiw (I preferred Preserve Them, O Lord: A Guide for Orthodox Couples in Developing Marital Unity by John Mack, but that's a different type of book). The other two (by Frs. Alexander and Meletios) I haven't read yet.

A Conversation With Met. Kallistos Ware On The Sacramental Lifehttp://ancientfaith.com/podcasts/illuminedheart/a_conversation_with_met_kallistos_ware_on_the_sacramental_life"Today Kevin's guest host on the program is Father Steve Tsichlis, Senior Pastor of Saint Paul's Greek Orthodox Church in Irvine, California. Fr Steve's special guest for this exclusive Illumined Heart interview is HisEminence, Metropolitan KALLISTOS [Ware]. Their topic is: UNDERSTANDING THE SACRAMENTS. Saint Paul’s recently hosted His Eminence, Metropolitan KALLISTOS to Southern California, for a two-day, packed-house seminar to the general public titled, “Drawing Closer to the Savior: The Sacramental Life”.

Realized that I do not have any book on the sacraments and that would be a wise idea to do something about.So, what can you recommend for me to read?

Any help is greatly appreciated. :=)

I would second Asteriktos' recommendation of St. Nicholas Cabasilas (The Life of Christand his Commentary on the Divine Liturgy) but I would also suggest for a broader overview: The Divine Liturgy: A Commentary in the Light of the Fathers by Hieromonk Gregorios. Link provided below.